Which method should be used to solve the system? Explain your answer, including a description of the first step.x2 + y2 = 9-6x + y = 5
What will be an ideal response?
Substitution should be used, because using elimination would mean introducing an xy term into the second equation unnecessarily. The second equation should be solved for y.
Mathematics
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Verify that the given equation is an identity.cosh2x = 
What will be an ideal response?
Mathematics
Express the number in scientific notation.428.2
A. 4.282 x 10-3 B. 4.282 x 103 C. 4.282 x 102 D. 4.282 x 10-2
Mathematics
Factor out the greatest common factor.5x2 - 30x
A. 5x(x - 6x) B. x(5x - 30) C. 5x(x - 6) D. 5(x2 - 6x)
Mathematics
Find the numerical value of the expression for 
and 
x + 9
A. a) 5 b) 9 B. a) 27 b) 13 C. a) 36 b) 162 D. a) 13 b) 27
Mathematics